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Mon, 30 Jun 2025 02:24:07 -0700 (PDT) Received: from thomas-precision3591.imag.fr ([2001:660:5301:24:234c:3c9a:efe4:2b60]) by smtp.googlemail.com with ESMTPSA id ffacd0b85a97d-3a88c7ec6aesm9846368f8f.5.2025.06.30.02.24.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Jun 2025 02:24:07 -0700 (PDT) From: Thomas Fourier To: Cc: Thomas Fourier , Cheng Xu , Kai Shen , Jason Gunthorpe , Leon Romanovsky , linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] Fix dma_unmap_sg() nents value Date: Mon, 30 Jun 2025 11:23:46 +0200 Message-ID: <20250630092346.81017-2-fourier.thomas@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The dma_unmap_sg() functions should be called with the same nents as the dma_map_sg(), not the value the map function returned. Fixes: ed10435d3583 ("RDMA/erdma: Implement hierarchical MTT") Signed-off-by: Thomas Fourier --- drivers/infiniband/hw/erdma/erdma_verbs.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/infiniband/hw/erdma/erdma_verbs.c b/drivers/infiniband= /hw/erdma/erdma_verbs.c index af36a8d2df22..ec0ad4086066 100644 --- a/drivers/infiniband/hw/erdma/erdma_verbs.c +++ b/drivers/infiniband/hw/erdma/erdma_verbs.c @@ -629,7 +629,8 @@ static struct erdma_mtt *erdma_create_cont_mtt(struct e= rdma_dev *dev, static void erdma_destroy_mtt_buf_sg(struct erdma_dev *dev, struct erdma_mtt *mtt) { - dma_unmap_sg(&dev->pdev->dev, mtt->sglist, mtt->nsg, DMA_TO_DEVICE); + dma_unmap_sg(&dev->pdev->dev, mtt->sglist, + DIV_ROUND_UP(mtt->size, PAGE_SIZE), DMA_TO_DEVICE); vfree(mtt->sglist); } =20 --=20 2.43.0